12 volt to 19 volt converter

Mike sandor

Active Member
Jul 28, 2017
175
Eau Claire, Wisconsin
Boat Info
2007 320 Sundancer
Twin 496. Bravo 3
2018 3500 Chevy, Loadmaster trailer
Raymarine Axiom, Quantum 2
Engines
496 Mercruiser/Bravo III drives
I picked up a Samsung 32" tv for our boat. It uses a external converter, 110 AC input, 19 volt 55 watt output. I can pick up a 12 to 19 volt, 90 watt converter for around 20 bucks. Any reason I should not consider this? I was originally going to put in a much larger inverter, add a third bank of batteries, all for a t.v. With the low power needs of the t.v, this seems like a overkill.
 
I've used those for mobile server's good stuff.
 
55 watts at 12V works out to almost exactly 90 watts at 19V.

This is very wrong.

Watts is always watts, they don’t change.

What does change wit voltage is amps. More volts = less amps, which keeps wattage the same.


That being said, the converter of the higher wattage will be perfectly fine, as the load (in this case a tv) is what determines the power drawn through the power supply, your 55w tv will only draw 55w even if the power supply is capable of more..... consider this, you turn on a 10w light at home, the power supply is a multi gigawatt nuclear plant, how much power does the light draw?
 
It's just volts. As long as the converter can handle the current draw, it should be fine. That said, 55 watts at 12V works out to almost exactly 90 watts at 19V. I'd consider getting the next size up.

https://www.amazon.com/uxcell-Conve...25478175&sr=8-3&keywords=12v+to+19v+converter

Also this thing will throw off heat so make sure its mounted such that it gets some decent airflow.

If this throws off that much heat, there must be some efficiency loss so the power consumption would be higher than what the TV consumes. How inefficient are they?
 
This is very wrong.

Watts is always watts, they don’t change.

What does change wit voltage is amps. More volts = less amps, which keeps wattage the same.


That being said, the converter of the higher wattage will be perfectly fine, as the load (in this case a tv) is what determines the power drawn through the power supply, your 55w tv will only draw 55w even if the power supply is capable of more..... consider this, you turn on a 10w light at home, the power supply is a multi gigawatt nuclear plant, how much power does the light draw?

When you're right, you're right.
 
I must agree that the stepup regulator is the way to go. I am planning the exact same think as I also got the 32" Samsung and it waiting for me to install.

Has anyone sourced the right angle DC plug for the Samsung? I was hoping not to have to cut up a brand new inverter cord out of the box.

-Kevin
 
to bad you got one that is 19v. I built a ice shack last winter and went on the hunt specifically for 120volt tv's that have a 12volt brick. I found some rca's (rled2445a) and some Haiers are set up conveniently this way ($150 cad). cut the brick off and attach direct to your battery and viola! 720p led tv with no inverters. each draw about 2 amps at the most, so with 2 TV's and two underwater Marcum cameras I'm able to go over 24 hours easily without a charge using 2 group 27 batteries.. Each component draws around 2 amps. my TV's are only 22 and 24''s but I believe you can find 32's that have the 12 volt brick.
shack.jpg
 
oh I forgot to mention, ive heard ("heard") that a 19 volt led tv may work anyways direct to a 12 volt battery. but I have never tested that myself.
 
Actually, going bigger on a 19 volt power supply could be a good idea- many laptops also run on 19v bricks, as do some sound bars. The bricks supplied its tvs laptops etc tend to be big and not as efficient as they could be, and having a clean efficient 19 volt bus might kill a number of birds with one stone
 

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